Surveying
The First Point of Aeries

Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator

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Surveying
Circumpolar stars

Rotate round the celestial pole
Are seldom seen near the pole star
Rotate round the North Pole
Remain always above the horizon

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to eccentricity of verniers
error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect adjustment of plate levels
error due to imperfect graduations

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